Friday

February 24, 2017
Total # Posts: 2,656

**Trigonometry**

x = arctan[cot(10pi/9)] = arctan[1/tan(10pi/9) = arctan[1/tan((9+1)pi/9)] = arctan{1/tan([(9/9)+(1/9)]pi)} = arctan[1/tan(pi/9)] tan(x)-1/tan(pi/9)=0 [tan(pi/2)*tan(x)-1]/tan(pi/2)=0 tan(pi/2)*tan(x)-1=0 Express in sin and cos. Use identities also. (lol, go solve the details. ...

*November 27, 2016*

**Physics**

Thanks. :D

*November 27, 2016*

**Physics**

Block A, with a mass of 10 kg, rests on a 36.9° incline. It is attached to a string that is parallel to the incline and passes over a massless, frictionless pulley at the top. Block B, also with a mass of 10 kg, is attached to the dangling end of the string. The two blocks...

*November 27, 2016*

**Socials Studies**

What are the major changes?

*November 27, 2016*

**math**

length of each side of rhombus: a = sqrt[(AD)^2 + (BD)^2] / 2 Solve. a = 5 cm

*November 27, 2016*

**MATHS**

The question is an example of uniform circular motion -> circle. kph to mpm (meters per minute): 72kph -> 1200 m/min cm to m: 84 cm -> 0.84m circumference of the wheel = pi. diameter = 3.14 * 0.84m = 2.6376m length of 1 revolution = circumference = 2.6376m in 11 min: ...

*November 27, 2016*

**MATHS**

Circle.

*November 27, 2016*

**maths**

No one likes those subjects. They are all lying. (Just kidding!) English: 40*(3/8) = 15 students out of 40 likes it. Math: 40*(2/5) = 16 students out of 40 likes it. Science: 40*(3/4) = 30 students out of 40 likes it.

*November 27, 2016*

**math**

Speed formula: s = d/t distance (d) varies directly as speed (s): d is proportional to speed. d is also proportional to time (t).

*November 27, 2016*

**English**

For conformity and order.

*November 27, 2016*

**math**

SA = 6*a^2 = 6*(1)^2 = 6cm^2 the question just confuses you.

*November 27, 2016*

**physics**

F = m*a a = F/m F1 = m1*(12) F2 = m2*(3.3) F1 = F2 m1*(12) = m2*(3.3) m1 = m2*(3.3/12) 1. m = m1-m2 a = F/(m1-m2) a = F/[(m2*(3.3/12)-m2] a = (m2*3.3)/[(-29/40)*m2] a = -132/29 m/s^2 (<-- goes to negative direction) *if m = m2-m1, a = 132/29 m/s^2 2. m = m1+m2 a = F/[(m2*(3...

*November 27, 2016*

**Chemistry**

I don't get the part where you got the .00509 mol HCl. This is how I solved it. Ba(OH)2 + 2HCl ===> BaCl2 + 2H2O Note: M (molarity) = moles of solute / liters of solution m (molality) = moles of solute / kg of solvent 24.81 ml --> 0.02481 L Tip: to make ur life ...

*November 26, 2016*

**American Government**

When Alabama's governor refused to end the policy of segregation in public universities, he invoked which common argument for separation of powers under federalism? A.states' rights B.checks and balances C.direct initiative D.bicameral legislation I think the answer is...

*November 26, 2016*

**American Government**

A woman is asked to serve on a jury. Instead of hearing two sides of the case, she only hears from the prosecutors, who ask the jury to decide whether they think someone is probably guilty. The state will only arrest the person and hold a formal trial if the jury feels it ...

*November 26, 2016*

**Social Studies**

Describe the Texans’ actions—how Texas came to exist. (America - Mexico war)

*November 25, 2016*

**Calculus**

Find the biggest value of c that satisfy the Mean Value Theorem for integrals for f(x)= 1/(x+1)^6 on the interval [0,7]

*November 23, 2016*

**math-IS MY ANSWER RIGHT?**

I got 261 PI

*November 23, 2016*

**math-IS MY ANSWER RIGHT?**

Evaluate the surface integral S F · dS for the given vector field F and the oriented surface S. In other words, find the flux of F across S. For closed surfaces, use the positive (outward) orientation. F(x, y, z) = x i + y j + z4 k S is the part of the cone z = sqrt(x2...

*November 23, 2016*

**Math**

Evaluate the surface integral S F · dS for the given vector field F and the oriented surface S. In other words, find the flux of F across S. For closed surfaces, use the positive (outward) orientation. F(x, y, z) = x i + y j + z4 k S is the part of the cone z = sqrt(x2...

*November 23, 2016*

**Calc 3**

Evaluate the surface integral S F · dS for the given vector field F and the oriented surface S. In other words, find the flux of F across S. For closed surfaces, use the positive (outward) orientation. F(x, y, z) = x i + y j + z4 k S is the part of the cone z = sqrt(x2...

*November 23, 2016*

**Calculus**

Use Stokes' Theorem to evaluate C F · dr where C is oriented counterclockwise as viewed from above. F(x, y, z) = yzi + 9xzj + exyk, C is the circle x2 + y2 = 1, z = 3.

*November 23, 2016*

**Calculus**

I'm very confused on this?

*November 23, 2016*

**Calculus**

A particle moves along line segments from the origin to the points (3, 0, 0), (3, 3, 1), (0, 3, 1), and back to the origin under the influence of the force field F(x, y, z) = z2i + 2xyj + 3y2k. Find the work done.

*November 23, 2016*

**Calc**

Evaluate the surface integral S F · dS for the given vector field F and the oriented surface S. In other words, find the flux of F across S. For closed surfaces, use the positive (outward) orientation. F(x, y, z) = xy i + yz j + zx k S is the part of the paraboloid z = ...

*November 23, 2016*

**Calc**

Evaluate the surface integral S F · dS for the given vector field F and the oriented surface S. In other words, find the flux of F across S. For closed surfaces, use the positive (outward) orientation. F(x, y, z) = y i ? x j + z2 k S is the helicoid (with upward ...

*November 23, 2016*

**Calc**

Evaluate the surface integral S F · dS for the given vector field F and the oriented surface S. In other words, find the flux of F across S. For closed surfaces, use the positive (outward) orientation. F(x, y, z) = x i + y j + z4 k S is the part of the cone z = sqrt(x2...

*November 23, 2016*

**Calc**

Use Stokes' Theorem to evaluate C F · dr where C is oriented counterclockwise as viewed from above. F(x, y, z) = xyi + 5zj + 7yk, C is the curve of intersection of the plane x + z = 8 and the cylinder x2 + y2 = 9.

*November 23, 2016*

**Calculus**

The radius of a conical tank is 2.7 meters and the height of the tank is 4.3 meters. Water is flowing into the tank at a constant rate of 59.5 m3/minute. At the instant the the depth of the water is 0.6 meters, answer the following: (A) At what rate is the depth of the water ...

*November 23, 2016*

**Math**

Use Stokes' Theorem to evaluate C F · dr where C is oriented counterclockwise as viewed from above. F(x, y, z) = xyi + 5zj + 7yk, C is the curve of intersection of the plane x + z = 8 and the cylinder x2 + y2 = 9.

*November 22, 2016*

**Math**

Use Stokes' Theorem to evaluate S curl F · dS. F(x, y, z) = x2z2i + y2z2j + xyzk, S is the part of the paraboloid z = x2 + y2 that lies inside the cylinder x2 + y2 = 25, oriented upward.

*November 22, 2016*

**american goverment check answers**

thanks anonymous! 10/10 100% :)

*November 21, 2016*

**Calc III**

Find the absolute maximum of the function f(x,y) = x^2 + 4y on the set of points (x,y) that satisfy x^2 + y^2 < or = to 25. I understand that you have to check the endpoints and find critical points, but I cannot solve this. Thank you.

*November 20, 2016*

**history**

yup answers are correct according to -_-, 5 is just D btw

*November 18, 2016*

**Math**

I think they want me to take the square root of 25 (which is 5) and add -9 which becomes -4. So is -4 a whole number, integer, radical? I know it isn't irrational

*November 18, 2016*

**Math**

I said the answer as is. They want to know what type of number you get when you add the square root of 25 and -9. sorry I don't understand this stuff

*November 18, 2016*

**Math**

Answers: Whole Number Irrational Number Integer Radical

*November 18, 2016*

**Math**

I don't understand :(

*November 18, 2016*

**Math**

When added the square root of 25 and -9 which type of number is the sum?

*November 18, 2016*

**social studies**

Lmao^

*November 18, 2016*

**Art**

Use reference for starters. Watch drawing tutorials. Research. And most of all, practice.

*November 17, 2016*

**Math**

A rectangle is dilated using a scale factor of 6. The image is then dilated using a scale factor of 1/3. What scale factor could you use to dilate the original rectangle to get to the final rectangle. Explain.

*November 17, 2016*

**American Government**

those are right, 100%

*November 17, 2016*

**history**

i got 100%

*November 16, 2016*

**Math**

^ lol. anonymous answer is very smart. xD

*November 16, 2016*

**American Government**

yup, 100% correct. thanks anonymous

*November 15, 2016*

**Physics - Buoyant Force Question**

Find the buoyant force on a helium balloon in air (Standard Pressure and Temperature) if the balloon is spherical with diameter 12.0 cm.

*November 11, 2016*

**Physics - Angular Speed Question**

A merry-go-round can be modeled as a disk with radius 2.5 meters and mass of 150 kg. For this problem, assume the density is uniform. It is initially rotating at 2.0 rad/sec. Two children of mass 30 kg and 40 kg hop onto the merry-go-round and stay near the edge. What is the ...

*November 11, 2016*

**Physics Question**

Find the escape speed from (a) the Sun, (b) a white dwarf star with one solar mass (same as the Sun) and radius 10,000 km, (c) a neutron star of 2.0 solar masses and radius of 10.0 km, and finally (d) a star with 2 solar masses and radius 5930 m. Comment on the speed of part (d).

*November 11, 2016*

**Physics - Tension Question**

A uniform bar of mass 12 kg and length 1.4 m is held by a hinge on a vertical wall. A string is attached to the end so that the bar is in mechanical equilibrium. The angle between the bar and the string is 25o. Find the tension in the string.

*November 11, 2016*

**Math**

right^^^^

*November 9, 2016*

**MATH**

Consider F and C below. F(x, y, z) = 2xz + y2 i + 2xy j + x2 + 15z2 k C: x = t2, y = t + 2, z = 3t ? 1, 0 ? t ? 1 (a) Find a function f such that F = ?f. f(x, y, z) = x2z+xy2+5z3+C Correct: Your answer is correct. (b) Use part (a) to evaluate C ?f · dr along the given ...

*November 9, 2016*

**American Government**

B C B

*November 7, 2016*

**Physics - Gravitation**

Vesta, a minor planet in the Asteriod Belt between Mars and Jupiter, has a mean radius of 525 km and mass of 2.59 X 10^20 kg. The Dawn Spacecraft (m = 1240 kg) orbited Vesta in 2011 & 2012. How much energy did the spacecraft expend going from the 2750 km orbit to a 210 km ...

*November 5, 2016*

**Physics Gravitation Question**

Vesta, a minor planet in the Asteriod Belt between Mars and Jupiter, has a mean radius of 525 km and mass of 2.59 X 10^20 kg. The Dawn Spacecraft (m = 1240 kg) orbited Vesta in 2011 & 2012. A. Find the local acceleration due to gravity at the mean surface of Vesta. What is the...

*November 5, 2016*

**Physics Gravitation Question**

Vesta, a minor planet in the Asteriod Belt between Mars and Jupiter, has a mean radius of 525 km and mass of 2.59 X 10^20 kg. The Dawn Spacecraft (m = 1240 kg) orbited Vesta in 2011 & 2012. Find the local acceleration due to gravity at the mean surface of Vesta. What is the ...

*November 5, 2016*

**social studies**

it strengthened their resolve to fight

*November 4, 2016*

**social studies**

which statement correctly contrast the Lancaster turnpike with the national road 1. the Lancaster turnpike was a longer road 2. the national road required users to pay a toll to use it 3. the national road was a corduroy road 4. the Lancaster turnpike was limited to travel in ...

*November 4, 2016*

**Calc III**

Express the volume of the solid that the cylinder r = 4cos(theta) cuts out of the sphere of radius 4 centered at the origin with a triple integral in cylindrical coordinates. I have already found the intervals, but I cannot solve it. The bounds are -sqrt(16-r^2) < z < ...

*November 2, 2016*

**Calc**

Find the work done by the force field F(x, y, z) = y + z, x + z, x + y on a particle that moves along the line segment from (1, 0, 0) to (5, 2, 3).

*November 1, 2016*

**Calc**

Evaluate the line integral, where C is the given curve. C y^3 ds, C: x = t^3, y = t, 0 ? t ? 2

*November 1, 2016*

**Calc**

Evaluate the line integral, where C is the given curve. C z dx + x dy + y dz, C: x = t^4, y = t^5, z = t^4, 0 ? t ? 1

*November 1, 2016*

**la**

if you're for connexus academy , lun is correct

*November 1, 2016*

**chemistry**

Consider these reactions where M represents a generic metal 1. 2M(s) +6HCl(aq) --> 2MCl3(aq)+3H2(g) (deltaH)= -725.0 kj 2. HCl(g)-->HCl(aq) (deltaH)= -74.8kj 3. H2(g)+CL2(g) --> 2HCl(g) (deltaH)=-1845.0kj 4. MCL3(s) --> MCl3(aq) (deltaH)= -476.0kj Use the ...

*October 28, 2016*

**chemistry**

Given these reactions : X(s) + 1/2O2(g) --> XO(s) (Delta)H= -707.7 kj XCO3(s) --> XO(s)+CO2(g) (Delta)H= +381.9kj What is (delta)Hrxm for this reaction? X(s)+1/2 O2(g)+CO2(g) ---> XCO3(s) (Delta)H= ?

*October 28, 2016*

**chemistry**

Calculate the standard enthalpy change for the following reaction at 25 °C. H2O+C(graphite)(s) --> H2(g) +CO(g)

*October 28, 2016*

**chemistry**

The following equation is the balanced combustion reaction for C6H6: 2C6H6(L) + 15O2(g) --> 12CO2(g)+6H2O(L)+6543 kj If 7.700 g of C6H6 is burned and the heat produced from the burning is added to 5691 g of water at 21 °C, what is the final temperature of the water?

*October 28, 2016*

**chemistry**

If the heat of combustion for a specific compound is -1180.0 kJ/mol and its molar mass is 40.91 g/mol, how many grams of this compound must you burn to release 114.50 kJ of heat?

*October 28, 2016*

**chemistry**

A 2.50-g sample of powdered zinc is added to 100.0 mL of a 2.00-M aqueous solution of hydrobromic acid in a calorimeter. The total heat capacity of the calorimeter and solution is 448 J/K. The observed increase in temperature is 21.1 K at a constant pressure of one bar. Using ...

*October 28, 2016*

**chemistry**

When a 8.00-g sample of KBr is dissolved in water in a calorimeter that has a total heat capacity of 3.344 kJ·K–1, the temperature decreases by 0.400 K. Calculate the molar heat of solution of KBr.

*October 28, 2016*

**chemistry**

A researcher studying the nutritional value of a new candy places a 4.10-gram sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.47 °C. If the heat capacity of the calorimeter is 33.90 kJ·K–1, ...

*October 28, 2016*

**chemistry**

At constant volume, the heat of combustion of a particular compound is –3947.0 kJ/mol. When 1.311 g of this compound (molar mass = 136.58 g/mol) was burned in a bomb calorimeter, the temperature of the calorimeter (including its contents) rose by 4.343 °C. What is the...

*October 28, 2016*

**chemistry**

Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 7.00 MJ of energy (in the form of heat) if the temperature of the sodium is not to increase by more than 10.0 °C? Use CP= 30.8 J/(K·mol) for Na(l) ...

*October 28, 2016*

**chemistry**

When 1367 J of heat energy is added to 44.1 g of hexane, C6H14, the temperature increases by 13.7 °C. Calculate the molar heat capacity of C6H14.

*October 28, 2016*

**chemistry**

An 80.0-gram sample of a gas was heated from 25 °C to 225 °C. During this process, 346 J of work was done by the system and its internal energy increased by 8305 J. What is the specific heat of the gas?

*October 28, 2016*

**chemistry**

If you combine 360.0 mL of water at 25.00 °C and 120.0 mL of water at 95.00 °C, what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.

*October 28, 2016*

**Social Studies**

Mongoose is right

*October 28, 2016*

**Chemistry**

Draw the product(s) of the following reaction CH3-CH2-C(triple bond)C-CH2 ---------> ? (Na/NH3)

*October 27, 2016*

**Calc**

Use spherical coordinates. Evaluate Triple integral SSSE where E lies between the spheres x^2 + y^2 + z^2 = 25 and x^2 + y^2 + z^2 = 49 in the first octant.

*October 26, 2016*

**math**

Change from rectangular to cylindrical coordinates. (Let r ≥ 0 and 0 ≤ θ ≤ 2π.) (a) (3, −3, 2) (b) (−2, −2sqrt3, 5)

*October 26, 2016*

**calc**

Write the equations in cylindrical coordinates. (a) 3z = 2x^2 + 2y^2 (b) 7x^2 + 7y^2 = 4y

*October 25, 2016*

**Calc**

Find the rectangular coordinates of the point, whose cylindrical coordinates are given. (a) (4, π/4, 1) (x, y, z) = (b) (6, −π/3, 5) (x, y, z) =

*October 25, 2016*

**Calc**

Change from rectangular to cylindrical coordinates. (Let r ≥ 0 and 0 ≤ θ ≤ 2π.) (a) (3, −3, 2) (b) (−2, −2sqrt3, 5)

*October 25, 2016*

**Calc**

Write the equations in cylindrical coordinates. (a) 3z = 2x^2 + 2y^2 (b) 7x^2 + 7y^2 = 4y

*October 25, 2016*

**CALC**

Find the rectangular coordinates of the point, whose cylindrical coordinates are given. (a) (4, π/4, 1) (x, y, z) = (b) (6, −π/3, 5) (x, y, z) =

*October 25, 2016*

**Math**

Cheater! Do your own math. Cheating = Lazy. Work hard!

*October 20, 2016*

**Math**

Use a triple integral to find the volume of the given solid. The solid enclosed by the cylinder x^2 + y^2 = 9 and the planes y + z = 19 and z = 2.

*October 19, 2016*

**Math**

Use a triple integral to find the volume of the given solid. The tetrahedron enclosed by the coordinate planes and the plane 8x + y + z = 4

*October 19, 2016*

**Math**

Find center of mass of the lamina that occupies the region D and has the given density function ρ. D is the triangular region with vertices (0, 0), (2, 1), (0, 3); ρ(x, y) = 5(x + y) mass=30 Find center of mass

*October 19, 2016*

**math**

what is the solution to the following system? -2x-y=1 -4x-2y=-1

*October 19, 2016*

**CALC**

Use a triple integral to find the volume of the given solid. The solid enclosed by the cylinder x^2 + y^2 = 9 and the planes y + z = 19 and z = 2.

*October 19, 2016*

**CALC**

Use a triple integral to find the volume of the given solid. The tetrahedron enclosed by the coordinate planes and the plane 8x + y + z = 4

*October 19, 2016*

**SOCIAL STUDIES (CHECK answer)**

MS sue how does saying i agree help anyone

*October 19, 2016*

**Calc**

Find the mass and center of mass of the solid E with the given density function ρ. E is bounded by the parabolic cylinder z = 1 − y^2 and the planes x + 6z = 6, x = 0, and z = 0; ρ(x, y, z) = 4. m=? x, y, z=?

*October 19, 2016*

**Calc**

Use a triple integral to find the volume of the given solid. The solid enclosed by the cylinder x^2 + y^2 = 9 and the planes y + z = 19 and z = 2.

*October 19, 2016*

**math**

why do you need to tell everybody their location??? that makes no sense at all

*October 18, 2016*

**Calc**

Use a triple integral to find the volume of the given solid. The solid enclosed by the cylinder x^2 + y^2 = 9 and the planes y + z = 19 and z = 2.

*October 18, 2016*

**Calc**

Use a triple integral to find the volume of the given solid. The tetrahedron enclosed by the coordinate planes and the plane 8x + y + z = 4

*October 18, 2016*

**Calc**

Evaluate the triple integral. SSS(triple integral T 3x^2 dV where T is the solid tetrahedron with vertices (0, 0, 0), (1, 0, 0), (0, 1, 0), and (0, 0, 1)

*October 18, 2016*

**Calc**

Evaluate the following integral using three different orders of integration. *triple integral E (xz − y3) dV, where E = (x, y, z) | −1 ≤ x ≤ 3, 0 ≤ y ≤ 4, 0 ≤ z ≤ 3

*October 18, 2016*